What's the difference between cavern and hypogeum?

Cavern

Definition:

(n.) A large, deep, hollow place in the earth; a large cave.

Example Sentences:

(1) The horizontal portion of the intracavernous ICA as well as the whole aspect of the aneurysm could be exposed as a result of the extended opening of the cavernous roof anterior to the posterior clinoid process.
(2) This lesion was almost completely removed and was diagnosed as cavernous hemangioma.
(3) The authors discuss the problems of emergency treatment of cavernous hemangiomas of the liver.
(4) Direct visualization of the intercavernous sinuses on contrast-enhanced MR images may serve as an ancillary sign for the diagnosis of carotid-cavernous or carotid-dural fistulas near the sella.
(5) Direct surgical exposure of the cervical or cavernous internal carotid artery (ICA) was necessary in the remaining 3 patients, who had undergone unsuccessful surgical trapping.
(6) Other angiographic procedures also revealed marked hepatopetal collaterals (cavernous transformation) entering the liver through the hilum.
(7) The cavernous sinus is often involved pathologically, which can cause ocular motor nerve palsies with or without facial sensory disturbances.
(8) On the basis of previous reports, in which specific measurements of the cavernous portions of the internal carotid arteries are given, the authors believe that this case is unique.
(9) Neither adventitia nor nerve fibers were found in the cavernous hemangioma.
(10) Pharmaco-Doppler sonography includes the evaluation of blood-flow velocities within the dorsal and deep cavernous arteries of the penis before and after intracavernous application of a vasoactive drug.
(11) Cavernous hemangiomas of the brain stem are usually discovered accidentally during evacuation of a hematoma, and successful surgical treatment of these lesions is seldom achieved.
(12) In the first case, a great number of cavernous blood vessels has been found and this, according to the authors, may support the idea that the tumour aroses within the benign hemangioma.
(13) This appearance, similar in all respects to that seen with cavernous hemangioma of liver, is rarely reported in the literature.
(14) We studied a family in which the proband had an acute chiasmal syndrome secondary to a cavernous angioma of the optic nerve and chiasm.
(15) Eleven of 15 patients had middle cranial fossa involvement; cavernous sinus extension was observed in six patients.
(16) Based on findings for 30 patients, the authors assess the value of CT scans for the diagnosis of cavernous hemangiomas of the liver.
(17) Stenosis of cavernous portion of internal carotid artery due to tumoral involvement was also noted.
(18) The case is reported of a giant intracranial internal carotid artery aneurysm associated with a carotid-cavernous fistula following a closed head injury.
(19) The cavernous studio will play host to a half-sized football pitch, where pundits will demonstrate what players did or didn't do correctly and there are other technological innovations planned that marry broadband interactivity with live coverage.
(20) A case of thrombasthenia (Glanzmann) associated with an intracerebral cavernous angioma in a 32-year-old woman is reported.